Kanojo to Boku no Kouhai no Hanashi.
[Kaname (Siina Yuuki)] Jikken Jikken (Toaru Majutsu no Index) [Digital]
Hatsujou Kouhai
[Akuten Soushin (Kokutou Nikke)] Kanmusu Chakunin Inazuma Kyousei Ishu Kouhai (Kantai Collection -KanColle-) [English] [Doujins.com] [Digital]
Enjo Kouhai Soushuuhen 1
Fujun Isei Kouhai no Susume
Pote Kouhai
Kurogyaru Kouhai Otokono Musumederihero~Gyakuanarukoosu
Machikirenai Kouhai Kanojo Tsujinaka-Chan
[Naiyori alpha Zaidan (Kimotani)] Fudangi ga Opai de BIKINI wa Yariman nanoka? Yoko de Taiman Jikken (Tengen Toppa Gurren Lagann)
Kaikan♥Jikken
Uchi no Kouhai ga Iroiro Yuushuu Sugite Komatteru.
(C70) [Konno Seisakubou (Konno Azure)] Isei to Jikken Shitemiyou. (KiMiKiSS)
Astolfo Cos no Kouhai ga Satsueikaigo ni Mousou Onanie Suru Hanashi
Kawaii Ore no Imouto to Kouhai ga Sasotte Kuru. - Komachi & Iroha always have sex with hachiman.
Tensai Kagakusha Tick Ling Hakase no Toumei Kusuguri jikken
Kouhai Sensou Zenpen | Kouhai War First Part
Hansyoku Jikken
(C93) [MARCH (Minakuchi Takashi)] Boku no Mash no Kouhai Ryoku (Fate/Grand Order)
[Neko Blizzard] Shoujo Kusuguri Jikken
(C87) [Aroma Terrace (Niki)] Kouhai-chan to Asa kara Nyan Nyan
Enjo Kouhai In The Closet
Shinchou 175cm no Rikujou Shoujo wa Kouhai Danshi no Seishi o Nomitagaru
Kouhai-chan ni Eroi Koto sareru Hon
Enjo Kouhai 8
(C64) [Studio Kyawn (Murakami Masaki, Sakaki Shigeru)] Jikken Ningyou ~SRW α II Kusuha Mizuha~ (Super Robot Wars)
(C94) [Athome Shuka (Takunomi)] Enjo Kouhai Different Clothes [Chinese] [Decensored]
Saenai Heroine Series Vol. 9 Saenai Kouhai no Jishukurikata
[Urushiya Seitai Jikkenshitsu (Mimuda Ryouzou)] Mikakunin Shoujo Seitai Jitsuroku [Digital]
(COMIC1☆13) [Akapenguin (Asahina Hikage)] Tawawa na Kouhai-chan 2 + Tawawa na Omakebon (Getsuyoubi no Tawawa)
Boku wa Kouhai no Onahole
(C90) [X ∞ MODEL (Asagiri Tendou)] Kabane Hanshoku Jikken | Kabane Breeding Experiment (Koutetsujou no Kabaneri) [English] [constantly]
(C93) [kulmov_ (Kurowa)] Kouhai Channel (Fate/Grand Order) [Chinese] [上野联邦汉化组]
(AzuLan Musou 3) [Imobatake (Bareisho)] Mental Cube Jikken ni Okeru Jiko Narabi ni Higai Houkokusho (Azur Lane)
Kakuchou Jikken
Natsu, Asedaku no Kouhai to
Hifuu Ryoujoku 4 Renko Okusuri Jikken
[Egoistic Honey, Allegro Mistic, Kuroneko-kan (Hadumi Rio, Takano Yuki, Muririn)] Kouhai ni ♥♥ Sarechau Hon [2018-08-26]
[Akitarainu (Chakkaman)] Touhou Chara ga Doubutsu to no Akachan o Umu tame ni Kouhai Saserareru Juukan Hon (Touhou Project) [Digital]
Muttsuri Kouhai Mash ni Misetuketai
Ore no Kouhai no Kyuuai ga Kawaisugiru Ken ni Tsuite.